A computer cluster consists of a set of loosely connected computers that work together so that in many respects they can be viewed as a single system.

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Windows Server 2012 - Hyper-V - iSCSI SAN - All Hyper-V Guests stops responding and extensive disk read/write

We have a problem with one of our deployments of Windows Server 2012 Hyper-V with a 2 node cluster connected to a iSCSI SAN. Our Problem Our problem is that for some reason all of the VMs stops ...
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47 views

Multiple httpd with JBoss cluster: provide httpd HA

I have a working configuration like this: +-----+ +-----+ +-----+ +-----+ | i1 | | i2 | | i3 | ... | in | JBoss Cluster +--+--+ +--+--+ +--+--+ +--+--+ | ...
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42 views

SQL Failover Cluster IP Migration

I have a four node cluster setup which I need to migrate from subnet A to subnet B. The cluster has roughly 12 instances running on it. I've found articles to update the SQL Cluster IP, but I've got ...
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152 views

glassfish cluster fail at start

I got a problem trying to set a cluster up. I'm gonna describe detailed configuration(since I couldn't find a cluster example made on two different pcs, all of them were made on one localhost): 3 ...
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12 views

Are there any tools/APIs to check consistency of a windows cluster?

Things to be checked: Directory structures (recursive, with any attributes and properties) Configuration (equiv and partial conf, format specific or generic, with regex) Registry (presence of keys, ...
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36 views

MSTDC in SQL Server 2012 - Windows Server 2012 R2 with high availability

We had implemented SQL Server High Availability on two physical servers over the VPN network. SQL Server 2012, Windows Server 2012 R2. It was noted that, Distributed Transaction was working perfectly ...
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67 views

How can I run a CentOS (Red Hat) cluster in degraded mode?

I've installed Red Hat's cluster software on an install of CentOS 6.5, and use it to provide redundant routing from one network to another. This works fine, and I have a pair of boxes providing the ...
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40 views

Hardware configuration for head nodes (HDDs, memory, processor, redundancy)

I'm designing a head node whose primary function is to submit jobs to the Torque/Maui scheduler and secondary function is to run test jobs. Unfortunately, most hardware selection guides for clusters ...
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164 views

SQL Server 2012 Cluster BSOD

I'm trying to set up a SQL Server 2012 SP1 "AlwaysOn Failover Cluster Instance" on top of a Windows Server 2012 R2 cluster (cl01) consisting of 2x 2012 R2 nodes (sql1 and sql2). Hosted on VMWare ESXi ...
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31 views

pacemaker cluster heavy load with sbd and noop scheduler

Anybody have experience with nood scheduler? i know the sbd process is a real time process, so with default linux io scheduler cfq, the sbd process works very well on high io heave load. The noop ...
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146 views

RabbitMQ and federation. Cross datacenter virtual queue?

I'm building a system that sits in two datacenters for resiliancy, using a live / standby model. The system requires a message queue that delivers messages for processing by the system backend. My ...
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66 views

PostgreSQL replication lag Ubuntu 11.10/12.04

I've a PostgreSQL cluster running on Amazon AWS EC2 instances with streaming replication and "hot standby" option enabled. I'm now gradually upgrading it from Ubuntu 11.10 to Ubuntu 12.04 LTS and I've ...
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48 views

Firewall rules between windows cluster

I have been given the task to define firewall rules between 2 Windows clusters. The first cluster hosts a clustered middleware application and the second cluster hosts SQL Server. The 2 clusters are ...
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253 views

How to configure cluster.conf for failover routing two networks?

I'm routing between an "external" subnet with Internet connectivity and two "internal" subnets, using iptables forwarding on a Linux box running CentOS 6.4: I'd like to now duplicate this router ...
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167 views

mod_jk tomcat error handling

I have a strange problem with my tomcat cluster. The cluster consists of 1 Apache with mod_jk and 6 Tomcat servers - each tomcat server is a own virtual machine. The cluster works as expected, ...
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127 views

How to bind CIFS server to virtual IP in Windows Server 2012?

I'm a unix guy who is new to clustering with Windows. I have two Windows 2012 servers that have the StorNext clustered filesystem mounted as drives on each. If I try to add the File Sharing role, I ...
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54 views

OSPF on XEN host running several VMs

Is it possible to set OSPFs areas in a XEN environment to setup a virtual cluster? Main intention is to avoid a external router since all VMs will run inside the same machine.
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167 views

Unable to remote desktop using failover cluster name

I am using Microsoft Failover Cluster and I have 2 nodes - say node1 & node2. The nodes are successfully accessed by remote desktop. but the cluster name is not accessible. The cluster name is ...
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363 views

CMAN: using SBD (Storage Based Death) and watchdog as STONITH

I'm building up a 2-node cluster based on CMAN + Pacemaker cluster stack, but I have no hardware STONITH devices. However both nodes are connected to a shared storage via iSCSI and I would like to use ...
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74 views

Benefits of ARR in a load balanced environment (Azure)?

I've built a simple IIS 8 web farm on Azure VMs. The web farm has 3 instances (Windows Server 2012) using shared configuration. The load balancing is handled by the Azure's built-in load balancer. ...
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32 views

Partial mail sync for multi continent mail server expansion?

I am wondering if there is solution (we currently use Dovecot but another product is ok too), that would allow to setup a second Imap server (or proxy) that would work efficiently over slow links. An ...
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63 views

trying to understand network layer(s) in WebAPI server cluster

I'm in the process of building my first webAPI server cluster. The webAPI hosted by this cluster provides a hi-comute resource, where each task request requires between 0.5 and 1.0 seconds of CPU ...
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542 views

MySQL Cluster msql Node Does Not Connect

I have a mysql cluster consisting of the management node, two data nodes, and a mysql node. The two data nodes connect to the manager but when I try to connect the mysql node I get the following ...
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358 views

Apache httpd active/passive setup

I want to setup apache web server in active passive mode to support HTTP failover on Redhat linux 5 machine. I understand that 2 Linux boxes can be setup in HA using heartbeat or keepalived. Also, ...
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384 views

MSSQL 2012 cluster - inactive node trying to access shared disk?

I've got an odd issue with a SQL 2012 cluster. The cluster itself uses FC shared storage, and generally works perfectly. The SQL service works, and failover occurs as expected. The issue I have is ...
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238 views

SQL Server 2008 R2 cluster on Windows Server 20008 R2 issue

I have a SQL Server 2008 R2 cluster on Windows Server 20008 R2. There are 2 nodes node1 and node2 in the cluster. When I start node1 and node2, I get the following statue information from them: From ...
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331 views

Windows 2003 cluster: One node offline causes the cluster service on the other node to fail

I configured a 2 node cluster on 2 Windows 2003 machines with Exchange 2003 The resources: Majority node set Data volume Cluster IP Cluster network name Exchange 2003 system attendant (and all ...
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195 views

Set total memory limit with Torque

I run a moderately sized cluster and I am having a queue problem. For example I have a node with 128GB of memory and a program that I set the amount of memory per core. So for example if I set memory ...
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487 views

Cluster fails because of network loop

We have two hosts running 2008 R2 and Hyper-V. iSCSI SAN using a Equallogic 6k and ps4000 pooled together. They are connected to two Dell 6224 switches. I have one VLAN for the iSCSI and then another ...
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74 views

Service fails to start when failover kicks in

I created a Windows Service which hosts a WCF application looking at/binding to the Clustered MSMQ The Windows service was first installed on both nodes of the cluster. I then created a cluster of ...
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196 views

2008 R2 Cluster not failing over with iSCSI disconnect

So I have successfully set up a 2 node 2008 R2 cluster with SQL Server 2008. There are basically 3 networks. Public (client LAN) Private (Heartbeat between the two machines) iSCSI SAN (hosts ...
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63 views

MySQL cluster data node replacement

I have a MySQL cluster with 2 data storage nodes running from last 2 years. Just recently I have observed a hardware issue in one of the nodes (data storage). I may need to replace this node with new ...
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107 views

Resources for setting up clustered FTP servers on CentOS?

Does anyone have any resources that can lead me to a how-to or at least more information on setting up clustered FTP servers on CentOS? I'm very new to servers in general (all I've done is set up a ...
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241 views

I'm building a diskless php-fpm cluster, unpredictable /etc/statetab and looking for other building strategy

I'm building a 24 nodes php-fpm farm using three Supermicro MicroCloud (8 nodes in 3U, nice and tight) At first, I was planning to have each of them nodes have a disposable HDD with CentOS on (6 or 5 ...
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45 views

Which process is using my NAS?

I have a nas connected to my cluster. The NAS holds all our home directories. When I did a set of experiments last week, saving a 1 GB file to the nas took around 30 seconds. If i do the same to a ...
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358 views

node.js process won't die on unhandled exception

Running the following server.js: cluster(app) .use(cluster.logger(path_to_logs)) .use(cluster.stats()) .use(cluster.pidfiles(path_to_pids)) .use(cluster.cli()) ...
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119 views

Is it possible to open terminals in a grid layout when using ClusterSSH?

I'm using the ClusterSSH tool (using the cssh command) to admin clusters of between 4 and 8 machines. By default, each terminal onto a cluster host is tiled, and opened to the right of the previous, ...
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158 views

which project to create a single system image cluster?

I have to create a SSI cluster. For example, which of openssi or kerrighed do you recommend (referring to the latest versions)? Is there anything better? On the Web there's nothing recent.
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507 views

SolrCloud Zookeeper problem

Can I ask you to help me with SolrCloud? I try to setup a SolrCloud with 2 shards (and 1 replica for each shard) with 4 Zookeepers, but it fails:( My settings: 1) shard1 + Zookeper without ...
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499 views

JBoss Cluster Best Practices

I have found several articles by academics on how to setup JBoss clustering but I would like some opinions from people how have REALLY done it. First off in every serious article I've come across I ...
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56 views

Change the Identity of a JBOSS server in a cluster

I am trying to add an additional JBOSS server to a cluster. Currently, I just copied over an existing server's directory. Even after changing some basic parameters such as name etc, I noticed that ...
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104 views

How can I scale my RoR applications?

I am developing a Ruby On Rails application and would like to deploy in a production environment. I have multiple identically configured Ubuntu web servers I can use but I don't know how to scale ...
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721 views

Failover Cluster Quorum Failing

I have two nodes which boots from iscsi to implement windows 2008 cluster. And I'm using disk majority option as quorum over iscsi. But when the quorum's iscsi connection failed(May be san server ...
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650 views

SSL Thumbprint Registry setting for SQL Server 2008 clustered on Windows Server 2008

I'm deploying an active/passive, two node fail over Windows Server 2008 cluster to support a SQL Server 2008 instance. I'm attempting to configure SQL Server to use a certificate issued by my domain's ...
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18 views

How to make shared space from HDDs of nodes in a cluster?

I have a 2-node cluster with each node having two HDDs. I want make a scratch space common to both nodes using the second HDD of each cluster. I mounted the 2nd HDD of master node as /home and have an ...
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65 views

RHEL/Centos 6 Cluster multi-site configuration with Pacemaker and split brain situation

I would configure a 4-nodes cluster using RHEL 6.5 and Pacemaker as reported in the official documentation ...
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23 views

Weblogic Cluster returns URL of dead instance in WSDL

We have a clustered Oracle 11g (in fact an OSB) that exposes a JAX-RPC service. When we call http://host2:7102/Foo/FooSvc?WSDL (host2), we get back: <L5G3N2:service name="FooService"> ...
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185 views

Using Openfire for distributed XMPP-based video-chat

I have been tasked with setting up a distributed video-chat system built on XMPP. Currently my setup looks like this: Openfire (XMPP server) + JingleNodes plugin for video chat OpenLDAP (LDAP ...
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44 views

What do I need to increase my processing power?

Ok so I have written this program in Python 2.7 that runs on a desktop machine running Arch Linux. Without getting into the big details, this program takes a data-point, performs a series of ...
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42 views

Homogeneous cluster versus heterogeneous cluster

By homogeneous cluster I mean a cluster of nodes that all have the same services running. I am trying to set up a cluster of nodes that offer a set of services. The cluster can respond to HTTPS ...